Mask for printing machines



July 12,1927. 1,635,618

v F. HAMMOND MASK FOR PRINTING MACHINES Filed May 6. 1924 gwuawtoz dv WPatented July 12,1927.

2 uni-ran srarss FREDERICK HAMMOND, OF HOUSTON, TEXAS, ASSIGNOB TO H. F.COHEN.

MASK FOR PRINTING MACHINES.

Application fl'led May 6, 1924. Serial No. 711,495.

This invention relates to newand useful in'iprovcments in a mask forprinting machines.

()ne object of the invention is to provide a printing machinemaskof suchconstruction that it will hold the sensitized paper in proper relationto the film, so as to give a correct and uniform n'nirgin to the printedpicture thus obviating the necessity of trimming the completed picture.

Another object of the invention is to provide a printing machine mask ofsuch con struction that the films maybe passed through the machine in astrip, and the pictures successively and quickly printed, thus making itunnecessary to cut the strip into individual films for printingpurposes.

A further feature of the invention resides in the provision of a verysimple type of mask-for printing machines by the use of which theprinting process may be easily and quickly accomplished.

With the above and other objects in view, this invention hasparticular'relation to certain novel. features of construction,operation and arrangement of parts, an example of which is given in thisspecification, and illustrated in the accompanying drawings, whereinFigure 1 is a vertical sectionalview of a printing machine, with themask applied thereto.

Figure 2 shows, a horizontal sectional view of the machine showing aplan view of the mask thereon.

- Figure 3 shows a plan view of the mask; and, Q

F i gure 4 shows an edge view thereof.

Referring now more particularly to the drawings, wherein like numeralsof reference designate similar parts in each of the figures, the numeral1 designates the casing of the printing machine whose upper sidedeclines forwardly and is provided with the transparent printing table2. The numeral3 designates the platen which is suitably mounted by meansof the hand operated lever, or handle 4, and the toggle/links .5, 5, sothat it may be firmly pressed against the paper in printing, and raisedtherefrom when the printing process has been completed. In the casing 1there is a lamp 6, wired in circuit with a. suitable battery, or othersource of electrical energy, and the electrical circuit is equip ed withan automatic switch 7 through w rich the circuit is completed, theinstant the platen presses against the paper and broken simultaneouslywith the raising of the platen. This obviates all possibility ofexposing the paper before or after it is in absolute contact with thenegative. The parts of the printing machine hereinbefore described areof conventional construction and are adverted to for the purpose of aclearer understanding of the advantages and method of use of theimproved type of mask presently to be described.

This mask is in the form of a rectangular plate 8, preferably of copper,and having the marginal perforations 9, 9, near one edge, to receive thehooks 10, 10, above the table v2, to hold the mask superimposed inproper relation above the table.

The mask also has an opening 11 therethrough, usually rectangular inform, through which the paper is exposed to the light. This opening isof the required size to accommodate the negative, masks with openings ofdifferent sizes being used for different sizes of negatives or pictures.Spaced from one side and from one end of the opening are the rib-likeabutments 12 and 13, against which the corresponding margins of theprint paper 14 abuts, and

these abutments hold the paper in proper position over the opening 11,so that the picture, when printed, Wlll be centered on the paper, with auniform margin, thus dispensing with the necessity of trimming thecompleted picture.

The strip of films 15 is passed over the table 2, and underneath themask without obstruction, so that negatives of a continuous strip may beprinted successively without the necessity of cutting the strip intoindividual negatives.

What I claim is:

The combination with a printing machine having a printing table formedwith a transparent portion, said machine also being provided with hooks,of a mask adapted to rest on said table and having an opening adapted toalign with said transparent portion, upstanding abutments on the uppersurface of the mask, said abutments being arranged in substantiallyright angular relation to each other and spaced from one side and oneend respectively of said opening, said mask having perforations throughwhich said hooks are adapted to engage to hold the mask in properalignment with said transparent por- 10 tion.

In testimony whereof I have signed my name to this specification.

FREDERICK HAMMOND.

